Cylinder 3 Above Knock Threshold
The knock sensor channel for cylinder 3 has registered combustion noise above the calibrated knock threshold beyond what the spark retard map can correct. Often associated with low-octane fuel, EGR malfunction or carbon-induced hot spots.
Affected components
- Knock sensor
- Spark plug
Common causes
- High likelihood: Low octane fuel used
- Medium likelihood: Carbon deposits causing pre-ignition
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.